Ok ive done research on this but all the different information is confusing me. I Have a P72 ECU, the thing is ive read that 92 is already pre-wired for VTEC from the ECU to shock tower plug, and all i need to do is add wires the KS( to D3 on the ECU) and IAB ( to A17 on the ECU). I'm wondering where do exactly these wires are coming from? the KS and the IAB and how would i know whats the KS and IAB wires? i have a diagram giving to me http://www.jdmhondaparts.com/tech/wiring.92-95.jpg but i really dont know how to use it? my engine is getting put in right now but the guy isnt sure about wiring Hondas. I've been told to buy a 92-95 Ex wiring harness but i really dont have the money to spare, because it would be much cheaper just to add these 2 Wires. and what about this 4 wire 02 Sensor? do i need to add anything like that? I would really appreciate the help.